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These 3 tools are used for special purposes such as laying track, setting up components for atlatc and inspecting locks for the interlocking system
The trackworker rotates track and changes its type. To use, look at the rail you want to change and click on it.
While the trackworker is useful for rotating rails after they have been placed, don't forget that when laying tracks by hand you can still make curves by placing the rails at an angle. See the tutorial.
This tool is used to help set nice names for passive components for the LuaAutomation system. To use it, right-click on any passive component, and a box will appear in which you can enter a name for that passive component. Once you have set that name, you can then reference that position from Lua code as a string.
This tool is used to help inspect and manually place locks for the interlocking system. To use it, right-click on switches or signals. It will open a formspec that tells you whether there is a lock applied to that component and where that lock came from.
If there is no lock currently applied, you can manually place one, and it will persist until it is manually removed. If a lock is applied, you can remove it. Removing a lock that was automatically placed is useful in case a route is removed but still set, but in general it is not recommended